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Commit a1ece821 authored by Will Deacon's avatar Will Deacon
Browse files

arm64: Introduce arm64_force_sig_info and hook up in arm64_notify_die 



In preparation for consolidating our handling of printing unhandled
signals, introduce a wrapper around force_sig_info which can act as
the canonical place for dealing with show_unhandled_signals.

Initially, we just hook this up to arm64_notify_die.

Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
parent a7e6f1ca

arch/arm64/include/asm/traps.h

+2 −0
Original line number Diff line number Diff line
@@ -37,6 +37,8 @@ void register_undef_hook(struct undef_hook *hook); 
void unregister_undef_hook(struct undef_hook *hook);

void force_signal_inject(int signal, int code, unsigned long address);

void arm64_notify_segfault(unsigned long addr);

void arm64_force_sig_info(struct siginfo *info, const char *str,

			  struct task_struct *tsk);



/*

 * Move regs->pc to next instruction and do necessary setup before it

arch/arm64/kernel/traps.c

+27 −1
Original line number Diff line number Diff line
@@ -223,13 +223,39 @@ void die(const char *str, struct pt_regs *regs, int err) 
		do_exit(SIGSEGV);

}



void arm64_force_sig_info(struct siginfo *info, const char *str,

			  struct task_struct *tsk)

{

	unsigned int esr = tsk->thread.fault_code;

	struct pt_regs *regs = task_pt_regs(tsk);



	if (!unhandled_signal(tsk, info->si_signo))

		goto send_sig;



	if (!show_unhandled_signals_ratelimited())

		goto send_sig;



	pr_info("%s[%d]: unhandled exception: ", tsk->comm, task_pid_nr(tsk));

	if (esr)

		pr_cont("%s, ESR 0x%08x, ", esr_get_class_string(esr), esr);



	pr_cont("%s", str);

	print_vma_addr(KERN_CONT " in ", regs->pc);

	pr_cont("\n");

	__show_regs(regs);



send_sig:

	force_sig_info(info->si_signo, info, tsk);

}



void arm64_notify_die(const char *str, struct pt_regs *regs,

		      struct siginfo *info, int err)

{

	if (user_mode(regs)) {

		WARN_ON(regs != current_pt_regs());

		current->thread.fault_address = 0;

		current->thread.fault_code = err;

		force_sig_info(info->si_signo, info, current);

		arm64_force_sig_info(info, str, current);

	} else {

		die(str, regs, err);

	}